6687140 has 24 divisors (see below), whose sum is σ = 14108472. Its totient is φ = 2662400.

The previous prime is 6687133. The next prime is 6687143. The reversal of 6687140 is 417866.

It can be written as a sum of positive squares in 4 ways, for example, as 506944 + 6180196 = 712^2 + 2486^2 .

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 6687097 and 6687106.

It is not an unprimeable number, because it can be changed into a prime (6687143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4490 + ... + 5790.

It is an arithmetic number, because the mean of its divisors is an integer number (587853).

Almost surely, 2^6687140 is an apocalyptic number.

It is an amenable number.

6687140 is an abundant number, since it is smaller than the sum of its proper divisors (7421332).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6687140 is a wasteful number, since it uses less digits than its factorization.

6687140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1567 (or 1565 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 6687140 is about 2585.9505022332. The cubic root of 6687140 is about 188.3996703339.

The spelling of 6687140 in words is "six million, six hundred eighty-seven thousand, one hundred forty".